Letter: X
- xbmc - Media center
- xmltv - A set of utilities to manage your TV viewing
- xroar - A Dragon 32, Dragon 64 and Tandy CoCo emulator
- xtables-addons - Extensions targets and matches for iptables
- xtables-addons-kmod - Kernel module (kmod) for xtables-addons
- xvidcore - MPEG-4 Simple and Advanced Simple Profile codec